Flop Resistance Controlled Circulating Current Minimization of Parallel Quadratic Step-Up Converter in DCMicro grid Applications

Abstract

In many situations high Current is required in high demand applications likeall automized industries, DC Microgridetc., Same converter modules connected in parallel combination results in generation of higher output current, but when connecting two converters in parallel creates the problem ofuneven distribution of current in each converter module due to Mismatch component Parameter tolerances, similarly in existing methods of all parallel converter used buck converter and boost converters to minimize the circulating current and percentage error. This study proposes two quadratic step-upconverters (QSC)in parallel connection called parallel Quadratic Step-up Converter (PQSC)with even distribution ofcurrent in both QSC by implementing passive flop resistance control method(FRC). By using this flop resistance control of QSC method adaptively adjust the reference voltage and also controls the converter duty ratio to achieve equal sharing of current in both Quadratic step-up converters.The adjustment of converter switch on time depends on output current, output voltage of each converter, overall output current, output voltage, Flop Resistance, Cable Resistance of both the converters. The MATLAB simulation model verify the usefulness of the proposed control technique. This effort of proposed control method achieve equal current sharing , reducescirculating current and percentage error of current sharing difference even though para-meters of two converter modules are different.